Twenty-two people have been confirmed dead and around 50 others injured by police who are now treating the explosion that happened outside the Manchester Arena as a terrorist incident until they “know otherwise”.

A large number of ambulances and police vehicles are at the scene following a number of unconfirmed reports of explosion-like noises. However, no reports of an explosion have yet been officially confirmed.

“Officers are at Manchester Arena following reports of an explosion within the foyer area of the stadium at 10.30pm this evening,” British Transport Police said in a statement. “Emergency services are at the scene and we are working to establish more information regarding the explosion and will provide further updates as soon as possible.”

Concert goers were filmed fleeing the area following what witnesses described as a loud bang.

Greater Manchester Police responded to the scene, calling it a “serious incident” and has advised people to stay away from the area.

“Emergency services are dealing with an incident near Manchester Victoria, resulting in all lines being closed," National Rail said in a statement. “Trains are currently unable to run to/from Manchester Victoria. Some trains will be canceled throughout or start/terminate at alternative stations."